Existential Exodus is a book by a family friend. I haven’t gotten my copy yet, so I’ll just quote this Amazon Review by “Motorcycle Boy”:
Although one might get the impression from Surfergirl’s synopsis that Existential Exodus falls in the genre of “addiction fiction”, this is not the case. Henry defeats his drug addiction soon after escaping the City. He continues to dabble but it doesn’t control his life. The novel is about a quest to fill that void. It’s a ride most of us can relate to. Hold out your thumb.